<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>文本框内容的显示和隐藏</title>
  <link rel="stylesheet" href="文本框内容的显示和隐藏.css">
</head>
<div class="Main">
  <input type="text" placeholder="目前为空" id="input">
</div>
<body>
<script src="文本框内容的显示和隐藏.js"></script>
</body>
</html>